Questions tagged [decryption]

Process of decoding an encrypted message with an authorized access (knowledge of the protocol, the encryption algorithm and the key).

31 questions with no upvoted or accepted answers
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Reverse engineer TPMS sensor data

I'm trying to reverse engineer data received from TPMS (car tire pressure) sensors. I was able to receive and demodulate the data (433 MHz, FSK, Manchester encoding). Probable packet fields: ...
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1answer
127 views

How does IPA decryption works?

All IPAs being downloaded from AppStore gets encrypted on servers as part of FairPlay DRM. But decryption is accomplished on local device. As far as I know there is some hardware module which contains ...
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275 views

EEPROM data bytes verification

I'm investigating a tool. I have an section of an eeprom memory dump that this tool uses, shown in the figure below. By my inquiries, the two bytes highlighted in red are based on the bytes ...
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0answers
153 views

Guessing checksum 8 bit ASCII algorithm

I am trying to reverse engineer an 8-bit checksum algorithm of a Chinese machine with RS485 communication and ASCII encoding. I tried with all the algorithm I could find, but it seems that data ...
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647 views

Obtaining the decryption keys for Super Mario Run (Android/iOS Game)

Super Mario Run is a il2cpp Unity game. Most of its assets are downloaded in-game through http requests. I particularly want the OGG files of the music. I can see the list of their names comes from ...
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329 views

Struggling with an archive file format using “encryption”

I am currently working on a file format used to pack (storage only, no compression) different file types together for transport. There is some sort of very simple "encryption" used and so far I have ...
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268 views

How to decrypt files given access to the decryption formula (bash) and passwords (Mach-O binary)

I have a decryption formula, the file it links to containing file passwords, and the encrypted files themselves, but I still don't understand how to reverse the process. Question: Do I need any more ...
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2k views

How to decrypt the config.bin from ZTE ZXV10 H201L

I have this file from my router its backup of user config,I suppose its compresed with zlib and encrypted with AES. Utility which is resposible to compress it and encrypt it is called cspd. In side ...
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539 views

find CRC algorithm, having some input and output data pairs

I'm trying to discover the algorithm of a lost software, there is an equipment that requiest some data, and validates the data using the "KEY", if you change any parameter of the data then you need a ...
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95 views

Decrypting the Config file of a Huawei router “HG630 V2”

followed that post from Wordpress https://hg658c.wordpress.com/2017/12/04/decrypting-configuration-files-from-other-huawei-home-gateway-routers/ Extracted the 4 Hex strings needed. But, looks ...
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78 views

Sniffing TCP packets using Wireshark

I am trying to reverse engineer a decoder. The decoder contains a web server that makes sending/receiving information through the Internet possible. To do so I need to sniff the packets that the ...
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85 views

Decrypt ibt.sfi linux firmware(Intel Wireless 8265 Linux Bluetooth)

Why I want to decrypt: Intel 8265 Bluetooth is likely a RAMUSB device, which needs system to update firmware. I try to transplant this linux firmware to macOS. Problems I met: The macOS BT firmware ...
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281 views

Reverse crypto algorythm, based on AES

Hello! I'm working on reversing one library (shared object) written for ARM architecture. It's obfuscated or packed with something pretty strong what makes debugging much harder and almost impossible ...
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145 views

Reverse engineering key fob checksum

I am trying to reverse engineer the key fob of my Ford Fiesta 2014 but I am stuck at finding the used checksum algorithm. I've successfully demodulates the key fob signal (using on-off keying + ...
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81 views

File Decryption Problems

over the past year, I provided an English patch to a community of thousands of players of a game I love and which is not available in English (just Chinese and Korean). Sadly, besides me, other ...
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126 views

Reverse engineer checksum in AC Sharp IR packet

i use microcontroller and received ir frame of air conditioner SHARP. This Ir frame have 13 byte data (in decimal number, not hex) like below: 85 90 243 8 131 140 66 0 176 1 32 7 133 85 90 243 8 142 ...
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121 views

Difficulty decrypting nested PKCS #7 / AES router configuration file

I am trying to decrypt a router configuration backup file that appears to be a combination of a 128-byte header, a PKCS #7 encrypted file, and another OpenSSL salted format encrypted file. I think ...
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367 views

Need Help decrypting .luac files

I have been recently trying to decrypt .luac files inside an encrypted android app. I tried to follow some of the previous threads here but the following frida script didn't give any output. ...
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108 views

Reverse engineering proprietary database file format .IDF

I have an old (I think) Windows software on a cd-rom, that is basically a database and its interface for show the data it contains. I don't like the software view interface, want to make my own with ...
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0answers
106 views

How can I make these images appear normal?

I'm trying to extract some images from a PS Vita game. I've managed to get a load of .bin files with names 00000.bin, 00001.bin and so on, but the file types are not the same. Each even numbered file ...
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82 views

Do any of these details contradict the idea that theory that this file is encrypted with Blowfish?

I have a file which has been encrypted with some unknown algorithm. Doing research on the file format, I stumbled across a website that claimed (without explaining why) that these files were encrypted ...
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919 views

Decrypting Firmware File

I am by no means a hardware or software expert. But I've got a bit of a dilemma. I have on my hands an "encrypted" firmware image. I say that with air quotes because I'm not sure if it's encrypted, ...
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43 views

Reversing a serial communication with two inputs

I'm making a device that needs me to transfer some sort of initiation code like handshaking to start further communications. There is 2 inputs and 2 outputs the first output is pretty similar to a two'...
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62 views

Reverse ASCII checksum algorithm

I am looking to reverse engineer what appears to be a 24-bit ASCII checksum. I tried the standard CRC 16 and 32-bit checksums and they don't work. Any pointers would be appreciated. Here is some ...
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77 views

What kind of compression/encryption could this be?

I am dealing with a file that seems to use some kind of proprietary compression/encryption I can't figure out. I have a lot of sample files as well as different versions of the same file, so I have ...
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218 views

Decrypting Lua Files from game

I'm truing to decrypt LUA scrpits from cocos2dx game (for wiki). Links to files of game: libhellolua.so (cocos2dx external library) example encrypted LUA-scripts (*.abc files) I was reading a ...
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91 views

how can i Encrypt a decrypted zte zxhn h108n V2.5 config file?

i have decrypted the config file using a program i found online ( maybe made by python to exe ) so to decrypt using it you type is command into CMD decode_zte_config.exe config.bin config.bin.xml ...
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91 views

find a video file in memory dump of a process

I have a player that plays encrypted video files and works like this: I open an encrypted video file with it it decrypts the video file and writes it to its memory and plays the file from the memory ...
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62 views

How to guess the key of XOR encryption in java?

I am trying to find the key of XOR encrypted string in java. It is very much probable that the key is eight characters long. I have the encrypted string. I am not able to understand how to go ...
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849 views

How does iOS hash and salt passwords on its secondary-storage?

I bought a used iPhone from someone, but I accidentally got a lock screen on the phone and can't figure out what the passcode is. Long story short, how does iOS hash the passcodes for entry, what kind ...
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1answer
709 views

Reversing sha1 hash with 2 captured hashes

As an exercise we need to reverse a SHA-1 to get the 'original' message. All we know is that the lowercase SHA-1 of the code gives: B39ECFBC2C64ADBB7C7A9292EEE31794D28FE224 And, the SHA-1 of the ...